Dissertations / Theses on the topic 'Contrôleurs adaptatifs'
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Turki, Marwa. "Synthèse de contrôleurs prédictifs auto-adaptatifs pour l'optimisation des performances des systèmes." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR064.
Full textEven though predictive control uses concrete parameters, the value of these latter has a strong impact on the obtained performances from the system to be controlled. Their tuning is not trivial. That is why the literature reports a number of adjustment methods. However, these ones do not always guarantee optimal values. The goal of this thesis is to propose an analytical and original tuning tuning approach of these parameters. Initially applicable to linear MIMO systems, the proposed approach has been extended to non-linear systems with or without constraints and for which a Takagi-Sugeno (T-S) model exists. The class of nonlinear systems considered here is written in quasi-linear parametric form (quasi-LPV). Assuming that the system is controllable and observable, the proposed method guarantees the optimal stability of this closed-loop system. To do this, it relies, on the one hand, on a conditioning improving technique of the Hessian matrix and, on the other hand, on the concept of effective rank. It also has the advantage of requiring a lower computational load than the approaches identified in the literature. The interest of the proposed approach is shown through the simulation on different systems of increasingcomplexity. The work carried out has led to a self-adaptive predictive control strategy called "ATSMPC" (Adaptive Takagi-Sugeno Model-based Predictive Control)
Hoinville, Thierry. "Evolution de contrôleurs neuronaux plastiques : de la locomotion adaptée vers la locomotion adaptative." Versailles-St Quentin en Yvelines, 2007. http://www.theses.fr/2007VERS0022.
Full textLes recherches menées en robotique évolutionniste se sont avant tout focalisées sur l'évolution de contrôleurs neuronaux structurellement et paramétriquement figés, pour la locomotion de robots qui roulent, marchent, nagent ou volent. Cette démarche a permis la conception de contrôleurs bien adaptés à des environnements constants, mais non adaptatifs aux variations de ceux-ci. Pour y remédier, certains roboticiens ont suggéré de faire évoluer des neuro-contrôleurs non plus figés, mais plastiques. Notre approche s'inscrit dans ce revirement et vise à ce que les robots à pattes puissent adapter leur locomotion aussi bien aux perturbations extérieures, qu'aux éventuelles détériorations de leurs structures mécaniques. Nous proposons en premier lieu une revue des phénomènes de plasticiténeuronale et de leur modélisation, destinée essentiellement aux roboticiens. Nous dressons ensuite un état de l'art de l'évolution de neuro-contrôleurs plastiques et critiquons la plausibilité biologique des modèles développés. Notre première contribution s'inspire des travaux de la robotique évolutionniste et aborde le dilemme de l'évolution de contrôleurs à la fois flexibles et stables. Ainsi, nous employons des contraintes homéostatiques pour stabiliser la plasticité de contrôleurs assurant la locomotion d'un robot monopode confronté à une perturbation freinant son avancée. Notre deuxième contribution s'inspire des connaissances acquises sur les générateurs centraux de pattern (CPG) et leur plasticité. Ainsi,nous proposons l'évolution d'oscillateurs à relaxation soumis à neuromodulation pour la locomotion adaptative d'un robot myriapode confronté à d'éventuelles amputations de pattes
Alvaro, Mendoza Carlos Enrique. "Control strategies for permanent magnet synchronous machines without mechanical sensors by sliding modes." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0055.
Full textThis thesis proposes two adaptive sensorless controls based on sliding mode approach for interior permanent magnet synchronous motor(IPMSM). The proposed strategies are composed of an Adaptive High-Order Sliding Mode Observer (AHOSMO) in closed-loop with an Adaptive Super- Twisting Control (ASTWC), where the control and observer gains of the proposed strategy are reparameterized in terms of a single parameter. Then, the main advantage of this strategy is the adaptable laws are easy to implement, avoiding overestimates of gains that increases of chattering, reducing the time to tune the gains, and reducing the damage of the actuators. Furthermore, a strategy for angular position estimation error extraction is proposed. Then, from this information and using a parameter-free virtual system, AHOSMO isdesigned for estimating the angular position and speed in a wide speed range, where the estimated variables provided by this observer are obtained with greater precision, despite the variations of the parameters, achieving greater robustness. These estimated states are used in the proposed robust control to track a desired reference of speed and direct-axis current. A stability analysis of the closedloop system is presented, using a Lyapunov approach. In addition, the proposed strategy is validated throughout experimental and simulationset-up in order to show its effectiveness
Moez, Tnani Mohamed. "Adaptation d'algorithmes de synthèse de contrôleurs." Mémoire, Université de Sherbrooke, 2001. http://savoirs.usherbrooke.ca/handle/11143/4542.
Full textAn, Xin. "High level design and control of adaptive multiprocessor system-on-chips." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM023/document.
Full textThe design of modern embedded systems is getting more and more complex, as more func- tionality is integrated into these systems. At the same time, in order to meet the compu- tational requirements while keeping a low level power consumption, MPSoCs have emerged as the main solutions for such embedded systems. Furthermore, embedded systems are be- coming more and more adaptive, as the adaptivity can bring a number of benefits, such as software flexibility and energy efficiency. This thesis targets the safe design of such adaptive MPSoCs. First, each system configuration must be analyzed concerning its functional and non- functional properties. We present an abstract design and analysis framework, which allows for faster and cost-effective implementation decisions. This framework is intended as an intermediate reasoning support for system level software/hardware co-design environments. It can prune the design space at its largest, and identify candidate design solutions in a fast and efficient way. In the framework, we use an abstract clock-based encoding to model system behaviors. Different mapping and scheduling scenarios of applications on MPSoCs are analyzed via clock traces representing system simulations. Among properties of interest are functional behavioral correctness, temporal performance and energy consumption. Second, the reconfiguration management of adaptive MPSoCs must be addressed. We are specially interested in MPSoCs implemented on reconfigurable hardware architectures (i.e., FPGA fabrics), which provide a good flexibility and computational efficiency for adap- tive MPSoCs. We propose a general design framework based on the discrete controller syn- thesis (DCS) technique to address this issue. The main advantage of this technique is that it allows the automatic controller synthesis w.r.t. a given specification of control objectives. In the framework, the system reconfiguration behavior is modeled in terms of synchronous parallel automata. The reconfiguration management computation problem w.r.t. multiple objectives regarding e.g., resource usages, performance and power consumption is encoded as a DCS problem. The existing BZR programming language and Sigali tool are employed to perform DCS and generate a controller that satisfies the system requirements. Finally, we investigate two different ways of combining the two proposed design frame- works for adaptive MPSoCs. Firstly, they are combined to construct a complete design flow for adaptive MPSoCs. Secondly, they are combined to present how the designed run-time manager by the second framework can be integrated into the first framework so that high level simulations can be performed to assess the run-time manager
Hamelin, Jean-François. "Contrôle d'un réacteur de blanchiment à l'aide d'un contrôleur adaptatif à modèles pondérés." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ53579.pdf.
Full textMessier, David. "Conception d'un contrôleur adaptatif et implantation sur un système de climatisation à débit d'air variable." Mémoire, École de technologie supérieure, 2005. http://espace.etsmtl.ca/327/1/MESSIER_David.pdf.
Full textLibbrecht, Christophe. "Contrôleur évolutif et optimisé pour les miroirs déformables ferrofluidiques dans le cadre de l'optique adaptative." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/25943.
Full textAdaptive optics is an evolving technology and integrated part of many applications. Its contributions extend from the astronomical imaging to the data transmission in telecommunications domain including the improvement of ophthalmologic diagnostics. Its main asset consists of its deformable mirrors and, thus, its ability to correct a signal degraded by random perturbations. There are many kinds of deformable mirrors. These with a continuous surface and also with several segments. A great variety of methods exists to control the surface geometry: hydraulics, piezoelectric, electrostatic and magnetic systems have been developed in the last years. The most recent creation in adaptive optics is the ferrofluidic mirror. The ferrofluidic mirrors have many advantages. First, their manufacturing cost is very low. Moreover, a simple combination of magnetic fields is required to modify the shape of their surface and can give strong amplitudes of deformation (about millimeter). These mirrors are developed and studied in the COPL laboratory of Université Laval where they are the main target of the actual work. Nowadays the constant increasing number of actuators decrees the development of optimized methods to control deformable mirrors. A captured image or signal can require from some tens to several hundreds of Hertz to be corrected. The calculations must be at their fastest. On other hand, the increasing number of actuators raises a question about what strategy to deploy for getting the best control on the surface of deformable mirrors. Do we use a single controller for all the actuators? Or on the contrary do we need to equip each actuator with a dedicated controller? For any chosen strategy, the most important step is the calibration phase. In adaptive optics, this procedure is quite simple even though it sometimes takes a long time for finding the optimized parameters. What is the best method to calibrate a controller? Is an automatic calibration possible? Can we develop an evolving controller able to adapt to environmental variations without human action. There is some interrogation about the best way to apply th strategy. Can it be more efficient? Are there any limitations? If so, can we solve them? The subject of this document is to answer the previous questions regarding ferrofluidic mirrors. The final purpose of this work is to develop an evolving and optimized controller able to manage systems with several tens as well as several hundreds of actuators and, also, adapt itself to variations of surrounding conditions.
Tamisier, Lucie. "Adaptation des populations virales aux résistances variétales et exploitation des ressources génétiques des plantes pour contrôler cette adaptation." Thesis, Avignon, 2017. http://www.theses.fr/2017AVIG0696/document.
Full textPlants carrying major resistance genes have been widely used to fight against diseases. However, the pathogensability to overcome the resistance after a few years of usage requires the search for efficient and durable resistances.The objectives of this thesis were (i) to identify plant genomic regions limiting pathogen evolution by inducinggenetic drift effects and (ii) to study the impact of the evolutionary forces imposed by the plant on the pathogenability to adapt to resistance, the goal being to further use these forces to limit pathogen evolution. The pepper(Capsicum annuum) – PVY (Potato virus Y) pathosystem has been mainly used to conduct these researches.Regarding the first objective, quantitative trait loci (QTL) were mapped on a biparental pepper population andthrough genome-wide association on a pepper core-collection. These approaches have allowed the detection ofgenomic regions on chromosomes 6, 7 and 12 controlling viral effective population size during the inoculationstep. Some of these QTLs were common to PVY and CMV (Cucumber mosaic virus) while other were virusspecific.Moreover, the QTL detected on chromosome 6 colocalizes with a previously identified QTL controllingPVY accumulation and interacting with a QTL affecting the breakdown frequency of a major resistance gene.Regarding the second objective, a correlation analysis between the evolutionary forces imposed by the plant andan experimental estimation of the durability of a major resistance gene has been done. Experimental evolution ofPVY populations on plants contrasted for the levels of genetic drift, selection and virus accumulation they imposedhas also been performed. Both studies demonstrated that a plant inducing a strong genetic drift combined to areduction in virus accumulation limits virus evolution and could even lead to the extinction of the virus population.These results open new perspectives to deploy plant genetic factors directly controlling pathogen evolutionarypotential and could help to preserve the durability of major resistance genes
Navas, Matos Francisco. "Analyse de stabilité pour la reconfiguration de contrôleurs dans des véhicules autonomes." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM050/document.
Full textBenefits of autonomous vehicles are genuinely exciting, but the route to true autonomy in transportation will likely be long and full of uncertainty. Research on the last years is on the development of multi-sensor systems able to perceive the environment in which the vehicle is driving in. These systems increase complexity when controlling an autonomous vehicle, as different control systems are activated depending on the multi-sensor decision system. Each of these systems follows performance and stability criteria for its design, but they all must work together, providing stability guarantees and being able to handle dynamics, structural and environmental changes. This thesis explores the Youla-Kucera (YK) parameterization in dynamics systems such as vehicles, with special emphasis on stability when some dynamics change or the traffic situation demands controller reconfiguration. Focus is in obtaining simulation and experimental results related to Cooperative Adaptive Cruise Control (CACC), with the aim not only of using for the very first time YK parameterization in the Intelligent Transportation Systems (ITS) domain, but improving CACC state-of-the art. Stable controller reconfiguration results are given when non-available communication link with the preceding vehicle, cut-in/out maneuvers or surrounding vehicles with different dynamics, proving adapability, stability and possible real implementation of the YK parameterization as general control framework for autonomous vehicles
Weber, Jean-Francois. "Guider et contrôler les reconfigurations de systèmes à composants : Reconfigurations dynamiques : modélisation formelle et validation automatique." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD068.
Full textOur main goal is to allow the usage of temporal properties within an adaptation policy while takinginto account runtime verification specificities.In order to reach it, we define a component-based system model that supports dynamicreconfigurations. We introduce guarded reconfigurations in order to use primitive operations as“building blocks” to craft more elaborated reconfigurations involving, not only sequential, but also,alternate and repetitive constructs while ensuring the system’s configurations consistency.Furthermore, we extend (to external events) the temporal logic previously used to expressarchitectural constraints on configurations. Using, so called, progressive semantics, we can, in mostof the cases, evaluate (in a centralised or decentralised fashion) a temporal expression for a givenconfiguration using evaluations performed only at the previous configuration. We use this logic withinadaptation policies enabling the steering and control of dynamic reconfigurations at runtime.Finally, we implemented such adaptation policies in various case studies using frameworks such asFractal and FraSCAti. We also use behavioural fuzzing to test various specific aspects of a givenadaptation policy
Chomette, Baptiste. "Contrôles modaux actif, semi-adaptatif et semi-actif de structures intelligentes embarquées : application aux cartes électroniques." Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0100/these.pdf.
Full textOn-board structures such as electronic boards are submitted to severe stresses, particularly vibration. This extreme environment affects the structure’s expected lifetime. Some techniques can be used to increase their lifetime particularly in the case of complex structures. This dissertation presents firstly a method to reduce vibration using modal active control applied to on-board MBDA Printed Circuit Boards (PCB). This modal strategy permits to reduce on-board energy and to target the control energy only on the controlled modes using a minimum number of components. The control uses piezoelectric actuators and sensors. The method has been numerically and experimentally tested on the PCB with industrial boundary conditions and excitation levels. In the case of industrial mass production, dispersion leads to changes in mechanical and electromechanical properties. Moreover, boundary condition variations can induce mechanical properties variations. These variations can modify control performance and stability. This dissertation presents secondly a modal semi-adaptive control strategy, based on identification algorithms, aim at increasing control robustness. This strategy has been numerically and experimentally tested on the PCB for frequency and torque variations respectively. Finally, in the case of on-board structures, on-board energy used by the control must be minimal to reduce on-board mass. The last part of this dissertation presents a modal semi-active control strategy to eliminate operational energy. This method has been numerically tested on the most damaging mode of the PCB. This method could be used to increase PCB lifetime in future research
Aguado, rojas Missie María del Rocío. "On control and estimation problems in antilock braking systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS103/document.
Full textThis thesis addresses three problems related to the antilock braking system (ABS) in the context of the wheel dynamics: the estimation of the tyre extended braking stiffness (XBS) during an emergency braking situation, the control of the ABS based on the estimation of the XBS, and the estimation of the angular velocity and acceleration of the wheel from the measurements of an incremental encoder with imperfections. The general objective of this work is to develop tools aimed at improving the performance of braking systems by using techniques adapted from nonlinear control theory. The first part of the manuscript is devoted to the construction of a switched adaptive observer for the XBS, that is, an adaptive observer whose estimation gains switch between two possible values based on the sign of the system’s measured output. The stability of the observer is analyzed using tools for switched and cascaded systems, as well as concepts such as persistency of excitation and singular time-scale transformations. The second part of the manuscript is dedicated to the design of a control algorithm for the ABS. The control objective is formulated in terms of the XBS and a hybrid controller is designed so that the trajectories of the system satisfy the conditions required for the estimation of the XBS. The stability of the controller is analyzed using the Poincaré map. The third part of the manuscript focuses on the construction of an algorithm to estimate angular velocity and acceleration of the wheel and remove perturbations which are introduced by the encoder imperfections and whose amplitude and frequency are a function of the wheel's (real) position, velocity, and acceleration. The algorithm is based on the method known as time-stamping algorithm, as well as filtering and parameter estimation techniques. Experimental tests and numerical simulations illustrate the performance of the estimation and control algorithms presented in this thesis. In all cases our results are compared with respect to the state of the art
Lehalle, Charles-Albert. "Contrôle non linéaire et Réseaux de neurones formels : les Perceptrons Affines Par morceaux." Paris 6, 2005. https://tel.archives-ouvertes.fr/tel-00009592.
Full textLehalle, Charles-Albert. "Le contrôle non linéaire par réseaux de neurones formels: les perceptrons affines par morceaux." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00009592.
Full textLiu, Jianxing. "Contributions to Adaptative Higher Order Sliding Mode Observers : Application to Fuel Cell an Power Converters." Thesis, Belfort-Montbéliard, 2014. http://www.theses.fr/2014BELF0232/document.
Full textAutomotive PEM Fuel Cell systems rely upon a set of auxiliary systems for proper operation, such as humidifier, air-feed compressor, power converter etc. The internal physical states of the latter are often unmeasurable, yet required for their precise control. Observers provide a means of obtaining the unmeasured states of these auxiliary systems for feedback control, optimal energy consumption and Fault Diagnosis and Isolation (FDI). This thesis is based on higher order sliding mode observer design studies for two major PEMFC auxiliary systems found in modern automobiles, the air-feed system and the power electronics system.The first part is focused on robust observation and FDI of the PEMFC air-feed systems. Sliding mode observer design and their applications to FDI have been studied in detail for this purpose and the key observation problems in this system have been identified. Based on this study, two solutions are proposed, a sliding mode algebraic observer for oxygen and nitrogen partial pressures and a novel robust adaptive-gain Second Order Sliding Mode (SOSM) observer based FDI for simultaneous state observation, parameter identification, health monitoring and fault reconstruction of the PEMFC air-feed system. The performance of the proposed observers has been validated on an instrumented Hardware-In-Loop (HIL) test bench.The observation and output feedback control problems of different power electronic converters, commonly found in fuel cell vehicles, are addressed in the next part. Robust output feedback SOSM control for three phase AC/DC converters have been presented. A robust SOSM observer for multi-cell converters has also been designed. The performance of all these designs has been demonstrated through a multi-rate simulation approach. The results highlight the robustness of the observers and controllers against parametric uncertainty, measurement noise and external disturbance
Peng, Zhaoxia. "Contribution à la Commande d'un Groupe de Robots Mobiles Non-holonomes à Roues." Phd thesis, Ecole Centrale de Lille, 2013. http://tel.archives-ouvertes.fr/tel-00864197.
Full textLin-Kwong-Chon, Christophe. "Approches neuronales adaptatives pour le contrôle tolérant aux défauts de systèmes pile à combustible." Thesis, La Réunion, 2020. http://www.theses.fr/2020LARE0008.
Full textThe proton exchange membrane fuel cell is a promising electrochemical converter for production of electricity from the decarbonated hydrogen carrier. However, some technological challenges limit its deployment, such as durability, reliability or financial cost. The active fault-tolerant control strategy is one of the solutions to mitigate any system fault according to three actions: diagnosis, decision and control. This study proposes to develop a generic controller module adaptive to health states through neural networks. Dynamic programming controller, reinforcement learning, and echo-state models are combined for the design of the adaptive controller. This controller employs three neural models with specific roles: an actor, a predictor and a critic. Flooding and membrane drying faults are considered in this study. The proposed controller was able to demonstrate interesting capabilities on a simulation fuel cell model in multi-variable regulation for oxygen stoichiometry, membrane pressure difference and temperature. The results show superior performance of the proposed controller compared to a proportional integral derivative controller. Stability analyses were conducted to prove the continuity of the adaptive controller. The controller has been validated experimentally on a single cell test-bench. The configuration of the test-bench imposed constraints specific to an on-line and real-time application. The generic nature of the controller offers the possibility to switch from one configuration to another without having to design another controller. Several tests are carried out for regulation of the zero-pressure difference at the membrane. The controller was validated on the occurrence of flooding and membrane dryness faults, including actuator and water purging disturbances. The approach and the generic controller adaptive to the states of health proposed in this thesis allow to satisfy control requirements regarding the fault-tolerant control strategy. The first interest lies in the compensation of the multilateral effects of faults that lead to unwanted dynamic changes. Another interest is to be able to modify in situ operating conditions, components or even auxiliaries while being able to ensure a stable and optimal control
Wei, Yan. "Planification et Suivi de Mouvement d’un Système de Manipulateur Mobile non-holonome à deux bras." Thesis, Ecole centrale de Lille, 2018. http://www.theses.fr/2018ECLI0004/document.
Full textThis thesis focuses on the motion planning and tracking of a dual-arm mobile humanoid. First, MDH is used for kinematic modeling. The co-simulation via Simulink-Adams on prototype is realized to validate the effectiveness of RBFNN controller. In order to overcome the shortcomings of Euler-Lagrange’s formulations that require calculating energy and energy derivatives, Kane’s method is used. In addition, physical stability is analyzed based on Kane’s method and a controller is designed using back-stepping technique. Secondly, an improved MaxiMin NSGA-II is proposed to design the mobile base’s (MB) optimal position-orientation and the upper manipulator’s (UM) optimal configuration given only the initial pose and end-effectors’ (EEs) desired positions-orientations. A direct connect algorithm combining BiRRT and gradient-descent is designed to plan the transition from initial pose to optimal pose, and a geometric optimization method is designed to optimize and cohere the path. In addition, forward motions are obtained by assigning orientations for MB thus indicating robot’s intention. In order to solve the failure problem of offline algorithm, an online algorithm is proposed while estimating dynamic obstacles’ motions. In addition, in order to optimize via-poses, an algorithm based on EEs’ via-points and MOGA is proposed by optimizing four via-pose-based objective functions. Finally, the motion tracking problem is studied given EEs’ motions in the task space. Instead of controlling the absolute motion, two relative motions are introduced to realize the coordination and cooperation between MB and UM. In addition, an modulated WLN technique is proposed to avoid joints’ limits
Maruani, Jonas. "Contrôle actif des vibrations de structures élancées FGPM." Thesis, Paris 10, 2019. http://www.theses.fr/2019PA100062.
Full textThe aim of this thesis is to show the feasibility and the efficiency of active vibration control by structures made of functionally graded piezoelectric materials (FGPM). One bloc structure, made of FGPM, with piezoelectric properties embedded, is used to replace classical intelligent structures (a host structure equipped with piezoelectric patches) and to remove their disadvantages (stresses concentrations near interface, delamination of patches, …).This study focuses on the FGPM’s modelization, in particular on the graded behavior laws and on the development of finite elements of FGPM beams and plates. Two finite element are implemented, a beam element based on Timoshenko’s kinematics and a plate element based on an adaptive kinematics. Both elements have a numerical layers approximation for the electrical potential. These two elements are used for active vibration control simulations. In the beam case, the system is governed by a linear quadratic regulator. Otherwise, for the plate a fuzzy decentralized regulator is developed and used. Both systems beam and plate are observed thanks to a Luerberger’s observer. Static studies show the behavior of FGPM depending on the material gradation. In addition, active vibration simulations show the feasibility of control with both systems and the ability of fuzzy regulator to accommodate to sudden changes on external perturbations
Peng, Zhaoxia. "Contribution à la Commande d’un Groupe de Robots Mobiles Non-holonomes à Roues." Thesis, Ecole centrale de Lille, 2013. http://www.theses.fr/2013ECLI0006.
Full textThis work is based on the multi-agent system / multi-vehicles. This thesis especially focuses on formation control of multiple nonholonomic mobile robots. The objective is to design suitable controllers for each robot according to different control tasks and different constraint conditions, such that a group of mobile robots can form and maintain a desired geomantic pattern and follow a desired trajectory. The leader-follower formation control for multiple nonholonomic mobile robots is investigated under the backstepping technology, and we incorporate a bioinspired neurodynamics scheme in the robot controllers, which can solve the impractical velocity jumps problem. The distributed formation control problem using consensus-based approach is also investigated. Distributed kinematic controllers are developed, which guarantee that the multi-robots can at least exponentially converge to the desired geometric pattern under the assumption of "perfect velocity tracking". However, in practice, "perfect velocity tracking" doesn’t hold and the dynamics of robots should not be ignored. Next, in consideration of the dynamics of robot with unknown parameters, adaptive torque controllers are developed such that the multi-robots can asymptotically converge to the desired geometric pattern under the proposed distributed kinematic controllers. Furthermore, When the partial knowledge of dynamics is available, an asymptotically stable torque controller has been proposed by using robust adaptive control techniques. When the dynamics of robot is unknown, the neural network controllers with the robust adaptive term are proposed to guarantee robust velocity tracking
Nasri, Ridha. "Paramétrage Dynamique et Optimisation Automatique des Réseaux Mobiles 3G et 3G+." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00494190.
Full textPeng, Xhaoxia. "Contribution à la Commande d’un Groupe de Robots Mobiles Non-holonomes à Roues." Thesis, 2013. http://www.theses.fr/2013ECLI0006/document.
Full textThis work is based on the multi-agent system / multi-vehicles. This thesis especially focuses on formation control of multiple nonholonomic mobile robots. The objective is to design suitable controllers for each robot according to different control tasks and different constraint conditions, such that a group of mobile robots can form and maintain a desired geomantic pattern and follow a desired trajectory. The leader-follower formation control for multiple nonholonomic mobile robots is investigated under the backstepping technology, and we incorporate a bioinspired neurodynamics scheme in the robot controllers, which can solve the impractical velocity jumps problem. The distributed formation control problem using consensus-based approach is also investigated. Distributed kinematic controllers are developed, which guarantee that the multi-robots can at least exponentially converge to the desired geometric pattern under the assumption of "perfect velocity tracking". However, in practice, "perfect velocity tracking" doesn’t hold and the dynamics of robots should not be ignored. Next, in consideration of the dynamics of robot with unknown parameters, adaptive torque controllers are developed such that the multi-robots can asymptotically converge to the desired geometric pattern under the proposed distributed kinematic controllers. Furthermore, When the partial knowledge of dynamics is available, an asymptotically stable torque controller has been proposed by using robust adaptive control techniques. When the dynamics of robot is unknown, the neural network controllers with the robust adaptive term are proposed to guarantee robust velocity tracking